Open Access. Powered by Scholars. Published by Universities.®
- Keyword
- Publication Year
Articles 31 - 54 of 54
Full-Text Articles in Life Sciences
Stress Induced Protein Changes In Tall Fescue, R. L.G. Long, Lance T. Adams, J. D. Corely, Alvan A. Karlin, B. L. Parsons, Maurice G. Kleve, J. Henle
Stress Induced Protein Changes In Tall Fescue, R. L.G. Long, Lance T. Adams, J. D. Corely, Alvan A. Karlin, B. L. Parsons, Maurice G. Kleve, J. Henle
Journal of the Arkansas Academy of Science
Tall fescue (Festuca arundinacea Schreb.), the most important pasture grass in Arkansas, exhibits different agricultural properties when it is infected by its mutualistic endophyte Acremonium coenophialum Morgan-Jones and Gams. We postulate that the presence of endophyte exerts a stress on the host that enhances or detracts from the host's ability to express specific genes. We tested this hypothesis by heat stressing infected and non-infected, juvenile and mature tall fescue, and examining their protein profiles by SDS-PAGE analysis. The results indicate that mature, infected, stressed grass produced greater amounts of Rubisco (ribulose bisphosphate carboxylase-oxygenase) than all other treatments. Additionally, the mature, …
Synopsis Of The Genus Tropisternus (Coleoptera Hydrophilidae) In Arkansas, George L. Harp
Synopsis Of The Genus Tropisternus (Coleoptera Hydrophilidae) In Arkansas, George L. Harp
Journal of the Arkansas Academy of Science
No abstract provided.
Measuring Shrubland Vegetational Structure Using Avian Habitats As An Example, Douglas A. James
Measuring Shrubland Vegetational Structure Using Avian Habitats As An Example, Douglas A. James
Journal of the Arkansas Academy of Science
Vegetational sampling of avian habitats stresses the use of methods primarily designed for forest birds. This paper describes a technique for sampling vegetational structure in uneven patchy habitats such as shrublands. Using the method, avian habitats in old field shrublands of northwestern Arkansas were analyzed.
New Records Of Vertebrates In Southwestern Arkansas, C. Renn Tumlison, Mark R. Karnes, Mark E. Clark
New Records Of Vertebrates In Southwestern Arkansas, C. Renn Tumlison, Mark R. Karnes, Mark E. Clark
Journal of the Arkansas Academy of Science
No abstract provided.
Photosynthetic Efficiency Of Drought-Induced Leaves In Neviusia Alabamensis, Jennifer Martsolf, Robert D. Wright
Photosynthetic Efficiency Of Drought-Induced Leaves In Neviusia Alabamensis, Jennifer Martsolf, Robert D. Wright
Journal of the Arkansas Academy of Science
Plants in one stand of Neviusia alabamensis Gray (Rosaceae), a rare shrub, became drought deciduous in July, 1990, and grew new leaves following rains in August. In September the photosynthetic efficiency of the new leaves was compared with that of old leaves in another stand of the same population. Although leaf area from regrowth was much less than old leaf area retained, photosynthetic efficiency in new leaves was about 3 times higher than in old leaves. This response is discussed in terms of compensation for drought-induced loss of leaves.
Survey And Annotated Checklist Of The Later Summer Flora Of The Moist Soil Units At Holla Bend National Wildlife Refuge, Stephen A. Walker, George P. Johnson
Survey And Annotated Checklist Of The Later Summer Flora Of The Moist Soil Units At Holla Bend National Wildlife Refuge, Stephen A. Walker, George P. Johnson
Journal of the Arkansas Academy of Science
We conducted a floristic survey of 22 moist soil units at Holla Bend National Wildlife Refuge during September and October of 1990. The moist soil units range in size from 0.4 to 9.7 ha and are depressions manipulated to provide food and shelter for waterfowl. In total, 60 taxa representing 24 families and 42 genera were identified and are compiled into an annotated checklist. The flora was dominated by the following families and genera in decreasing order of importance: Asteraceae (Xanthium), Polygonaceae (Polygonum), and Amaranthaceae (Amaranthus). The Poaceae and the Cyperaceae were well represented, but were of lesser importance. Twenty-three …
Sexual Dimorphism And Intersexual Differences In Resource Allocations Of A Dioecious Shrub, Lindera Melissifolia (Walt.) Blume, Dennis J. Richardson, Robert D. Wright, Shannon Walker
Sexual Dimorphism And Intersexual Differences In Resource Allocations Of A Dioecious Shrub, Lindera Melissifolia (Walt.) Blume, Dennis J. Richardson, Robert D. Wright, Shannon Walker
Journal of the Arkansas Academy of Science
Morphometric data were gathered to make intersexual comparisons on the morphology and reproductive resource allocation patterns of the rare, dioecious shrub, Lindera melissifolia. Females produced significantly fewer flowers and leaves than did males. No other significant differences could be detected in morphology. Female "clones" exhibit low area coverage and low stem density, which suggests higher costs of reproduction. If this is the case, the deficits produced in resource allocations directed toward sexual reproduction seem to result in increased mortality and/or reduced vegetative reproduction.
Effects Of Juglone (5'-Hydroxy-1, 4-Naphthoquinone) On The Algae Anabaena Flos-Aquae, Nostoc Commune, And Scenedesmus Acuminatus, V. Diane Randall, Jimmy D. Bragg
Effects Of Juglone (5'-Hydroxy-1, 4-Naphthoquinone) On The Algae Anabaena Flos-Aquae, Nostoc Commune, And Scenedesmus Acuminatus, V. Diane Randall, Jimmy D. Bragg
Journal of the Arkansas Academy of Science
Three species of algae, Anabaena flos-aquae, Nostoc commune and Scenedesmus acuminatus were selected for their sensitivity to juglone and studied for the effects of juglone concentrations of 10, 1, 0.5, 0.1 and 0.01 μg/ml upon their growth. A. flos-aquae was most sensitive, with significant inhibition by the 0.5 μg/ml concentration. N. commune was inhibited least, with significant inhibition only in the 10 μg/ml concentration. S. acuminatus was found to be moderately inhibited at the 0.5 μg/ml concentration. All species were found to be non-viable after 14 days exposure to 10 μg/ml juglone. Tests with 7 and 14 day old cells …
Isolation Of Nuclei From Physarum Flavicomum: Demonstration Of Nuclear Cyclic Acid Amp Phosphodiesterase, Judith A. Bean, Maurice G. Kleve, Thomas J. Lynch
Isolation Of Nuclei From Physarum Flavicomum: Demonstration Of Nuclear Cyclic Acid Amp Phosphodiesterase, Judith A. Bean, Maurice G. Kleve, Thomas J. Lynch
Journal of the Arkansas Academy of Science
Cyclic AMP phosphodiesterase activity in the nucleus of the myxomycete Physarum flavicomum was demonstrated by cytochemical staining utilizing electron microscopy and by enzymatic assays with tritiated cyclic AMP as the substrate. Cytochemical staining showed Physarum's plasmodial phosphodiesterase activity to be located in the nucleus, along the plasma membrane, in vesicles, and free in the cytoplasm. Nuclear phosphodiesterase, which may be cell cycle dependent, was primarily located in the nucleolus. Nuclei from three to five day old microplasmodial cultures were isolated by the method of Henney and Yee. Whole cells were collected through centrifugation and washed. Pellets were homogenized in a …
Gas Chromortographic Analyses Of Biocrude-Producing Trees, Roy Z. Gehring, Bob D. Johnson
Gas Chromortographic Analyses Of Biocrude-Producing Trees, Roy Z. Gehring, Bob D. Johnson
Journal of the Arkansas Academy of Science
Gas chromotographic procedures were used to compare commercial diesel fuel with cyclohexane, ether, and methanol extracts from various tree species. Standard n-paraffin hydrocarbons ranging from C-10 thru C-34 were used as standards. These analyses indicated that several extracts, notably those from Juniper virginiana (juniper) and Pinus echinata (pine) trees of Northeast Arkansas and the Brazilian tree Copaifera langsdorffii (copaiba), contain numerous hydrocarbon and selected chemical products which serve as potential renewable biocrude sources.
Prairie Phenology And Seed Germination, Donald E. Culwell, Robert Wright
Prairie Phenology And Seed Germination, Donald E. Culwell, Robert Wright
Journal of the Arkansas Academy of Science
No abstract provided.
Zinc Nutrition Of Rice Plants As Influenced By Seed Germinated In Zinc Solutions, Narsimaha R. Kasireddy, Lyell F. Thompson
Zinc Nutrition Of Rice Plants As Influenced By Seed Germinated In Zinc Solutions, Narsimaha R. Kasireddy, Lyell F. Thompson
Journal of the Arkansas Academy of Science
In recent years a physiological disorder of rice (Oryza sativa L.) seedlings growing in soils high in exchangeable calcium has been diagnosed as zinc deficiency. Calculations show that less than 30 g of zinc is needed to satisfy the nutrition of a hectare of 6-8-wk-old rice plants. Rice seed was soaked and germinated in dilute solutions of zinc ethylenediamine tetraacetate, zinc sulfate and zinc lignosulfonate prior to planting in greenhouse pots containing a zinc-deficient soil. The rice plants grown from the zinc-treated seed produced more growth and sorbed more zinc than rice plants grown from untreated seed.
Seed Germination In Ginkgo Biloba L. I. Influences Of Cold Treatment, Gibberellic Acid And Red Light, Michael I. Johnson, James L. Wickliff
Seed Germination In Ginkgo Biloba L. I. Influences Of Cold Treatment, Gibberellic Acid And Red Light, Michael I. Johnson, James L. Wickliff
Journal of the Arkansas Academy of Science
The influences of cold treatment, gibberellic acid and red light treatment on rate of germination of seeds of Ginkgo biloba L. were followed for a 12-wk period. Dispersal units were collected, and the outer fleshy layer was removed soon after harvest. Of water-imbibed, non-cold-treated seeds, 50% of those which germinated did so within 11 wk after planting. A single application of red light accelerated the 50% germination time by 3 wk. Imbibition in GA3 solution did not appear to accelerate germination. With 4-wk cold treatment the 50% germination time was accelerated 6 wk in water-imbibed seeds. Both red light and …
Impact Of Resistance To Pesticides On Cotton Insect Problems In Arkansas, Charles Lincoln, Jacob R. Phillips
Impact Of Resistance To Pesticides On Cotton Insect Problems In Arkansas, Charles Lincoln, Jacob R. Phillips
Journal of the Arkansas Academy of Science
No abstract provided.
Observations On Nuclear Division In Vegetative Hyphae Of Ceratocystis Fagacearum, James R. Aist, Charles L. Wilson
Observations On Nuclear Division In Vegetative Hyphae Of Ceratocystis Fagacearum, James R. Aist, Charles L. Wilson
Journal of the Arkansas Academy of Science
No abstract provided.
Identification Of Ninhydrin Positive Components In Ethanolic Extracts Of Rice Panicles By Paper Chromatography, C. I. Grable, J. E. Presley, George E. Templeton
Identification Of Ninhydrin Positive Components In Ethanolic Extracts Of Rice Panicles By Paper Chromatography, C. I. Grable, J. E. Presley, George E. Templeton
Journal of the Arkansas Academy of Science
No abstract provided.
Identification Of The Free Amino Acids Of Nematode Resistant And Susceptible Soybeans, J. R. Young, Robert D. Riggs
Identification Of The Free Amino Acids Of Nematode Resistant And Susceptible Soybeans, J. R. Young, Robert D. Riggs
Journal of the Arkansas Academy of Science
No abstract provided.
Quantitative Differences In Alanine In Rice Panicles Of Varieties Resistant And Susceptible To Kernel Smut, J. G. Goodman, George E. Templeton
Quantitative Differences In Alanine In Rice Panicles Of Varieties Resistant And Susceptible To Kernel Smut, J. G. Goodman, George E. Templeton
Journal of the Arkansas Academy of Science
No abstract provided.
Development Of Pleurotus Ulmarius Fr. Grown In Pure Culture, Delbert Swartz, J. D. Collar
Development Of Pleurotus Ulmarius Fr. Grown In Pure Culture, Delbert Swartz, J. D. Collar
Journal of the Arkansas Academy of Science
No abstract provided.
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Further Studies On An Antibiotic Substance Produced By Rhizopus Nigricans Ehrenberg, Kenneth D. Mace, Delbert Swartz
Journal of the Arkansas Academy of Science
No abstract provided.
Sample Numbers For Forage Production Determinations, E. S. Ruby
Sample Numbers For Forage Production Determinations, E. S. Ruby
Journal of the Arkansas Academy of Science
No abstract provided.
Cationic Activities And The Exchange Phenomena Of Plant Roots: Relationship To Practical Problems Of Nutrient Uptake, E. O. Mclean, D. Adams, F. E. Baker
Cationic Activities And The Exchange Phenomena Of Plant Roots: Relationship To Practical Problems Of Nutrient Uptake, E. O. Mclean, D. Adams, F. E. Baker
Journal of the Arkansas Academy of Science
No abstract provided.
Physiology Of Leaf Abscission, John M. Jackson
Physiology Of Leaf Abscission, John M. Jackson
Journal of the Arkansas Academy of Science
No abstract provided.
Effect Of Sodium Azide On Water Transfer In Root Tissue, Germaine Rachaner
Effect Of Sodium Azide On Water Transfer In Root Tissue, Germaine Rachaner
Journal of the Arkansas Academy of Science
No abstract provided.